High-reflectivity endoscopetransmittance calibrating method

Abstract

The invention discloses a high-reflectivity endoscopetransmittance calibrating method. The method uses a high-reflectivity optical element as a reference element, an output ring-down signal of an initial optical resonant cavity is firstly measured based on an optical cavity ring-down technology, and the ring-down time tau0 of the initial optical resonant cavity is obtained through fitting; afterhigh-reflectivity optical elements for reference are vertically and obliquely inserted at a small angle, a stable testing optical resonant cavity is formed, output ring-down signals of the testing optical resonant cavity are measured respectively when the high-reflectivity optical elements for reference are vertical and oblique at the small angle, the ring-down times tau1 and tau2 of the testing optical resonant cavity are obtained through fitting, and the residual reflectivity of the high-reflectivity optical elements for reference is calculated; when the high-reflectivity optical elements forreference are oblique at the small angle, the ratio of reflecting light intensity signals of the high-reflectivity optical elements for reference to transmitting light intensity signals of a high-reflectivity endoscope to be calibrated are measured, and high-reflectivity endoscopetransmittance calibration is achieved.

Description

Technical field [0001] The present invention relates to the technical field for measuring the parameters of optical elements, in particular to a method for measuring the transmittance of a high-reflection cavity mirror. Background technique [0002] High-reflective cavity mirrors are widely used in high-energy lasers, gravitational wave detection, laser gyroscopes and other technical fields. The accurate measurement of its optical parameters is particularly necessary. At present, the reflectance measurement of highly reflective optical elements is mainly based on the optical cavity ring-down technology (Li Bincheng, Gong Yuan; Overview of the measurement of optical cavity ring-down high reflectivity, "Laser and Optoelectronics Progress", 2010,47:021203), while the high reflectivity The accurate measurement of the transmittance of the cavity mirror is still a problem. At present, the measurement of the transmittance of reflective optical elements still uses spectrophotometry. The...

AI Technical Summary

Problems solved by technology

However, the transmittance calibration of high reflection output cavity mirror based on traditional spectrophotometric technology is limited by the measurement method, and the calibration accuracy is difficult to meet the requirements

Especially when the transmittance of the highly reflective output cavity mirror is as low as ppm, the measurement error based on spectrophotometric technology is even greater

Images